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T: Teilchenphysik

T 303: Diffraktion 1

T 303.4: Talk

Tuesday, March 16, 1999, 14:45–15:00, TE10

Diffractive vector mesons beyond the s-channel helicity conservation — •I. Ivanov^1,2 and N.N. Nikolaev^1,3 — ¹Institut für Kernphysik, Forschungszentrum Jülich, D-52425 Jülich — ²Novosibirsk University, Novosibirsk, Russia — ³L.D. Landau Inst. for Theor. Phys., Moscow

We derive the full set, and determine the twist, of helicity amplitudes for diffractive production of S and D-wave vector mesons in deep inelastic scattering. For large Q² all helicity amplitudes but the double spin-flip are calculable within perturbative QCD and are proportional to the gluon structure function of the proton at a similar hard scale. We find a substantial breaking of the s-channel helicity conservation which must persist also in real photoproduction.